Furnace construction



Feb. 16, 1937. HElTMAN 2,071,069

FURNACE CONSTRUCT ION Filed April 5, 1954 Patented Feb. 16, 1937 UNITEDSTATES PATENT OFFICE 5 Claims.

The object of my invention is to provide an improved furnaceconstruction, or boiler setting, in which the inner or refractory wallcan move vertically relative to the outer or less refractory wall, but,nevertheless, contact between the two walls is maintained, and in whichthe inner wall is vertically supported from the outer wall in such a waythat lower portions of the inner wall can be separated while the upperportions are vertically supported from the outer wall.

More specifically, my invention consists of a furnace settingcomprising, an outer wall, an inner wall of more refractory materialthan said outer wall, reinforcements for said outer wall, and connectorsbetween said reinforcement and certain of the bricks of said inner Wall,said inner wall having provisions between it and said outer wall, andbetween it and said connectors, for vertical movement of said inner wallrelative to said outer wall.

For a further exposition of my invention, reference may be had to theannexed drawing and specification at the end whereof my invention willbe specifically pointed out and claimed.

In the drawing:

Fig. 1 is a vertical cross-section, through a part of my device, showingthe inner wall in raised position;

Fig. ,2 is a horizontal cross-section through a part of my device;

Fig. 3 is a plan View of one connector member;

Fig. 4 is a plan view of another connector member; and

Fig. 5 is a side elevation of the connector member shown in Fig. 4.

In that embodiment of my invention chosen for illustration in thedrawing, my device is shown as consisting of an outer wall I, which mayconveniently be made of ordinary brick. 2 indicates a header course ofbricks anchored in and projecting from the outer wall and having lostmotion engagement with the inner wall. The courses of brick 2 do notoperate as a bond between the walls, but they serve to support the upperportion of the inner wall while the lower parts are being separated. Theinner wall 3 is conveniently made of bricks or tile of more refractorymaterial than the material of outer wall I. Outer wall I mayconveniently be provided with reinforcements 4, shown in the shape ofangle-irons having spaced perforations therein.

Inner wall 3 is conveniently provided with connector bricks or tiles 5,which are on their upper surfaces step-shaped and which have, at theirInner wall 3 and outer wall I are held together by connectors. Theseconnectors may conveniently consist of an outer connector or eye-bolt 8,having a nut 9 thereon, and a circular eye or head It. Eye-bolt 8 mayconveniently be made of steel. Co-operating with outer connector oreye-bolt 8 is an inner connector II, having a hook I2 at one end and aT-head l3 at its other end. Inner connector I I may conveniently be madeof cast iron, as it is exposed to a greater heat than is the eye-bolt 8.The connectorsare assembled by passing the eye-bolt 8 through aperforation in reinforcement 4, passing hook I2 through the head ofeye-bolt 8, and locating the head I3 of inner connector I I in the slotI of connector brick 5.

As is seen in Fig. 2, connector brick 5 may be of keystone shape inhorizontal plan or crosssection, so that its sides serve to retain aplurality of bricks 55, having sloping edges co-operating with thesloping edges of bricks 5 in a horizontal direction. This provides thatthe inner wall 3 is held to the outer wall I without the necessity ofproviding connectors for every brick of the selected courses of innerwall 3.

In the operation of my device, when inner or refractory wall 3 becomesheated due to the heat of the furnace or boiler, the inner wall 3expands more than does the outer wall I. The inner wall 3, therefore,slides in a vertical direction relative to the outer wall I. Spaces 6permit the inner wall 3 to rise relative to the header courses 2 of Ithe outer wall I, so that a space A is formed between the header courses2 and the inner wall 3. Simultaneously, head I3 slides in slot I ofbrick 5, the round shape of head I3 permitting this sliding with aminimum of friction, and serving to retain the inner wall 3 in contactwith the outer wall I.

The header courses 2 provide a convenient support for the inner wall 3when the latter is cool. This permits lower portions of the inner wall 3to be removed and replaced, without disturbing the upper portions of theinner wall 3 which are supported on the header courses 2 during suchremoval and replacement.

The connectors may be formed of one member if desired, but, by providinga connector formed, as shown, of two elements having a bendable jointtherein, the connectors may be more conveniently assembled, as thecourses of brick of the outer wall I may not be at exactly the sameheight as the courses of brick of the inner wall 3.

I do not intend to be limited save as the scope of the prior art and ofthe attached claims may require.

I claim:-

1. A furnace construction comprising, an outer wall, reinforcements forsaid outer wall, an inner wall of refractory material, connectorsretaining said inner and outer walls together and having horizontallyextending portions at their inner ends, and bricks in said inner wallconnected to the inner ends of said connectors by receiving the innerends of said connectors in vertical slots in said bricks, said brickshaving their top faces in step shape leaving spaces for movement of theconnectors in the event of expansion of said inner wall relative to saidouter wall.

2. A furnace construction comprising, an outer wall, header coursesprojecting from the inner face of said outer wall, angle-irons formingreinforcements for said outer wall, an inner Wall, connector bricks ofkeystone and of complemental shape in horizontal plan forming courses ofsaid inner wall and having at their inner sides slots of T-shape inhorizontal plan and having their top surfaces formed in step shapeleaving spaces underlying said header courses, eye-bolts passing throughsaid angle-irons and connected thereto, and inner connectors havinghooks connected through said eye-bolts and having heads at their innerends located in said slots of T- shape in said connector bricks.

3. A furnace construction comprising, an outer wall of brick and aninner Wall of interlocked refractory tiles constructed and arranged forrelative movement and to oppose the transfer of heat, a course of headerbricks fast in the outer wall and loose in the inner wall to oppose heattransfer there being spaces underlying said header bricks to permitmovement of the inner wall and to support the upper portions of thelatter when portions of the inner wall rest on the upper faces of saidheader bricks, and hinged throughbolts connecting said Wallssubstantially as described.

4. A furnace construction comprising, an outer Wall, header coursesprojecting horizontally from the inner face of said outer wall, saidheader courses being fast in said outer wall, an inner wall havingvertical faces abutting said outer wall and having orifices therein to,loosely receive the projecting portions of said header courses therein,said orifices providing space underlying the projecting portions of saidheader courses to provide for vertical movement of said inner wallrelative to said outer wall, and connectors retaining said inner andouter walls together, said connectors each having one end fast in saidouter wall and each having the opposite end mounted in a vertical slotin said inner wall vso that said inner wall is held against horizontalmovement but is free for vertical movement.

5. A furnace construction comprising, an outer Wall, header courses fastin said outer wall and having portions projecting from the inner face ofsaid outer Wall, an inner wall having vertical faces abutting the innerface of said outer wall and having orifices therein of sufiicient sizeto loosely receive the projecting portions of said header courses, saidorifices being of sufiicient size to provide space underlying theprojecting portions of said header courses to allow vertical movement ofsaid inner Wall relative to said outer Wall, reinforcements for saidouter wall, and connectors retaining said inner and outer wallstogether, said connectors each having one end fast in said outer walland each having the opposite end mounted in a vertical slot in saidinner wall so that said inner wall is held against horizontal movementbut is free for vertical movement.

' HERBERT HEITMAN.

